Effect of oestrus synchronisation on lamb birth weight

Pilla, A.M.; Pelosi, A.; Taranto, F.P. di; Aquila, S. dell'

Annali dell' Istituto Sperimentale per la Zootecnia 9(1): 15-24


Accession: 000353910

Download citation:  

Article/Abstract emailed within 1 workday
Payments are secure & encrypted
Powered by Stripe
Powered by PayPal

Data were collected over a 4-yr period on 1520 Apulian Merino (AM) and 1051 Wurttemberg Merino X (Ile-de-France X AM) lambs produced by females treated with FGA-impregnanted vaginal sponges followed by injection of 400 IU PMSG. The birth weight of 960 AM lambs conceived at the induced oestrus averaged 3.29 kg v 3.71 for 560 lambs conceived at the following oestrus, the difference being highly significant. For crossbred lambs, the figures were 3.90 v 4.35 kg, the difference being highly significant. Since the number of lambs born/100 females lambing was higher at the induced oestrus (143 in AMs and 130 in crossbreds) than at the following oestrus (110 and 110 resp.), the ratio of av. lamb weight produced/ female by ewes conceiving at the 1st oestrus to that produced by ewes conceiving at the 2nd oestrus was 1.11 and 1.04 resp.